And Klinsmann called upon Vogts in March, when he shook up his coaching staff just more than two months before the World Cup.
"He's very excited to be part of our path to Brazil and during the World Cup because that's where the big music is played, and he wants to be part of the big music," Klinsmann said. "For me he's been a big mentor throughout my life, and he just has an outstanding soccer brain, an outstanding knowledge the way he reads the game, the way he analyzes things with his tremendous experience he has, is unquestionable, a huge benefit for us."
After Tuesday, Vogts will endure a whirlwind stretch of travel and scouting.
He returns to Germany with Azerbaijan. Then he will drive to Rotterdam to see Saturday's friendly between Ghana and the Netherlands. The following day it's Cameroon vs. Germany in Moechengladbach.
"Then I come over to Boston and watch Portugal against Mexico, then I go to Jacksonville to be part of the (U.S.) team, then I stay two days longer in Miami and watch Ghana against South Korea," Vogts said.
The U.S. will play Turkey in New Jersey on Sunday, followed by a game against Nigeria in Florida before departing for Brazil to finalize preparations for its Group G opener against Ghana on June 16.
Vogts is perfectly content to contribute behind the scenes, without getting involved in personnel decisions or weighing in on Klinsmann's selection choices.
"I think it's a good group together, the U.S.," he said. "I'm not a coach. Maybe Jurgen has some questions for me about special things. I give him a clear answer. That is my part."